(2)  
Access Panels 6540 Refueling Station Access Door

Prepare for the System Test
 S 865-032-003
 (1)  Connect the external electrical power (AMM 24-22-00/201).
 S 865-063-003
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAPS. THE FLAPS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  Extend the leading edge flaps (AMM 27-81-00/201).
 S 495-034-003
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ INSTALL THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Install the locks on the leading edge flaps (AMM 27-81-00/201).

 S 655-035-003

 (4)  
Remove all the fuel from the fuel tank, and the fuel in the sumps (AMM 28-23-00/201).

 NOTE: If you do the trim for only one tank system, you can move
____
 the fuel into the other tanks.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 3 ú 03A Page 513 (BARFIELD SYSTEM TESTER) ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-036-003
 (5)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) QTY
 2) EP GND FUELING

 S 035-037-003
 (6)  
Remove the fuel quantity indicator from the pilots' panel.

 S 035-038-003

 (7)  
Disconnect the electrical connector from the rear of the fuel quantity indicator.

 S 485-039-003

 (8)  
Connect the test equipment (Fig. 504).

 (a)  
Connect the test harness to the airplane wire bundle.

 (b)  
Connect the test harness to the system test unit.

 S 015-058-003
 (9)  Do this procedure: "Fuel Summation Unit Removal"
 (AMM 28-41-81/401).

 E. System Test Procedure
 S 975-040-003
 (1)  Measure the empty tank resistances.
 (a)  
Set the TEST FUNCTION switch on the test unit to INSULATION.

 (b)  
Set the battery switch to ON.

 (c)  
Turn the METER ADJUST knob until the meter is at its maximum value.

 (d)  
Set the INS TEST POINTS switch to LO-Z/HI-Z.

 (e)  
Read the total resistance for the tank units.

 (f)  
Make sure the resistance shown on the test unit is more than 250 megohms.

 (g)  
Set the INS TEST POINTS switch to each of the SHLD or GND positions. 1) Make sure each resistance shown on the test unit is more

 than the applicable minimum resistance:
 SWITCH SETTING  MINIMUM RESISTANCE SH/HI-Z 1 Megohm SH/LO-Z 1 Megohm GND/HI-Z 10 Megohm GND/LO-Z 10 Megohms GND/SH 10 Megohms
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH ANALOG FUEL QUANTITY ú  28-41-00
 INDICATORS ú CONFIG 3 ú 01A Page 514 (BARFIELD SYSTEM TESTER) ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
DO NOT INDICATOR FUEL QUANTITY CONNECT
TO COMPENSATOR AND TANK UNITS
METER ADJUST KNOB INSTRUMENT TEST POINTS SWITCH
METER 
ADJUST  ON  TESTER 
INDICATOR  BATTERY 
OFF  SWITCH 
INS TEST POINTS  BATT 
GND/HI-Z  SH/LO-Z  TEST 
GND/LO-Z  SH/HI-Z 
GND/SH  LOZ/HI-Z 
COAXIAL 
TEST FUNCTION 
.1  INDICATOR INSULATION  1 CAP BRIDGE  CAP SIM  UNSHIELDED 
HI-Z  RANGE .01  2  TANK CAP pf  COAX HI-Z 
1  7  4  5 
LO-Z  LO-Z 

0-10 100 10
COMP GND
17
D.F.
COMP
PRESS TO MEASURE COMP SIM pf
　
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